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can be zero

Language: Layout:
[ + ] Compiler args [ + ] Show input
Compilation time: 0.39 sec, absolute running time: 0.14 sec, cpu time: 0 sec, memory peak: 3 Mb, absolute service time: 0.6 sec 
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+ 3 + 6 + 2 + 1 
- 3 + 6 + 2 + 1 
+ 3 - 6 + 2 + 1  sum is 0
- 3 - 6 + 2 + 1 
+ 3 + 6 - 2 + 1 
- 3 + 6 - 2 + 1 
+ 3 - 6 - 2 + 1 
- 3 - 6 - 2 + 1 
+ 3 + 6 + 2 - 1 
- 3 + 6 + 2 - 1 
+ 3 - 6 + 2 - 1 
- 3 - 6 + 2 - 1 
+ 3 + 6 - 2 - 1 
- 3 + 6 - 2 - 1  sum is 0
+ 3 - 6 - 2 - 1 
- 3 - 6 - 2 - 1 
false